<template>
  <div>
    <v-chart :forceFit="true" :height="height" :data="data">
      <v-coord type="rect" direction="LB" />
      <v-tooltip />
      <v-legend />
      <v-axis dataKey="State" :label="label" />
      <v-stack-bar position="State*流程数量"  color="流程状态" />
    </v-chart>
  </div>

</template>

<script>
const DataSet = require('@antv/data-set')

export default {
  name: 'StackBar',
  props: {
    dataSource: {
      type: Array,
      required: true,
      default: () => [
        { 'State': '请假', '流转中': 25, '已归档': 18 },
        { 'State': '出差', '流转中': 30, '已归档': 20 },
        { 'State': '加班', '流转中': 38, '已归档': 42 },
        { 'State': '用车', '流转中': 51, '已归档': 67 }
      ]
    },
    height: {
      type: Number,
      default: 254
    }
  },
  data() {
    return {
      label: { offset: 12 }
    }
  },
  computed: {
    data() {
      const dv = new DataSet.View().source(this.dataSource)
      dv.transform({
        type: 'fold',
        fields: ['流转中', '已归档'],
        key: '流程状态',
        value: '流程数量',
        retains: ['State']
      })
      return dv.rows
    }
  }
}
</script>
